Hook: Add class suffix for base class testing

refs #6928

library/Icinga/Web/Hook.php

@@ -41,6 +41,15 @@ class Hook
      */
     public static $BASE_NS = 'Icinga\\Web\\Hook\\';
 
+    /**
+     * Append this string to base class
+     *
+     * All base classes renamed to *Hook
+     *
+     * @var string
+     */
+    public static $classSuffix = 'Hook';
+
     /**
      * Reset object state
      */
@@ -114,7 +123,7 @@ class Hook
      */
     private static function assertValidHook($instance, $name)
     {
-        $base_class = self::$BASE_NS . ucfirst($name);
+        $base_class = self::$BASE_NS . ucfirst($name) . self::$classSuffix;
         if (!$instance instanceof $base_class) {
             throw new ProgrammingError(
                 '%s is not an instance of %s',